US2909452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric contact carbon brush
Assignee: British Thomson Houston Co Ltd
•
Filing: 1957-07-01
•
Granted: 1959-10-20
•
Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 Parriss Walter Henry
- 👤 Anderson Trevor James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/04; H01B1/20; H01B1/24; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/20; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
POROUS ELECTRIC CONTACT CARBON BRUSH MATERIAL HAVING SODIUM PYROPHOSPHATE INCORPORATED THEREIN, AND CONTAINING ALSO A POLYESTER RESIN MATERIAL POLYMERISED TO A SUBSTANTIALLY SOLID STATE IN A BRUSH COMPOSED OF SAID MATERIAL BY A SUITABLE TREATMENT OF SAID BRUSH.
Claim 2
Dependent Claim
38 words
POROUS ELECTRIC CONTACT CARBON BRUSH MATERIAL HAVING SODIUM PYROPHOSPHATE INCORPORATED THEREIN, AND CONTAINING ALSO A POLYESTER RESIN MATERIAL POLYMERISED TO A SUBSTANTIALLY SOLID STATE IN A BRUSH COMPOSED OF SAID MATERIAL BY A SUITABLE TREATMENT OF SAID BRUSH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |